Keyphrases
- information retrieval
- information retrieval systems
- search engine
- document retrieval
- information extraction
- information access
- document collections
- database
- structured documents
- real time
- query terms
- test collection
- language model
- question answering
- keywords
- retrieval systems
- decision trees
- metadata
- retrieval effectiveness
- learning to rank
- test bed
- language modeling
- real world
- vector space model
- information filtering
- language processing
- data sets